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arXiv 2402.10440cond-mat.mes-hallcond-mat.str-el
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双层石墨烯分数量子霍尔效应中的轨道竞争

Orbital Competition in Bilayer Graphene's Fractional Quantum Hall Effect

Bishoy M. Kousa, Nemin Wei, Allan H. MacDonald

AI总结:

研究双层石墨烯最低朗道能级中$n=0$与$n=1$轨道的竞争,发现其敏感依赖于粒子-空穴不对称性与Lamb移位,并确定了支持非阿贝尔准粒子的偶分母FQH态的$n=1$轨道稳固出现的条件。

摘要:

双层石墨烯的最低朗道能级具有八重内部自由度,由自旋、谷和轨道两能级系统组成。在低能量子涨落中,$n=0$ 轨道相对于 $n=1$ 轨道的优势,会导致与 $n=1$ 优于 $n=0$ 时截然不同的分数量子霍尔特性。$n=0$ 与 $n=1$ 轨道间的竞争敏感地依赖于粒子-空穴不对称性,以及由与负能海交换相互作用引起的 Lamb 移位,在评估该轨道竞争时必须同时考虑这些因素。我们确定了支持带有非阿贝尔准粒子的强偶分母 FQH 态的 $n=1$ 轨道作为低能朗道能级稳固出现的条件。

英文摘要:

The lowest Landau level of bilayer graphene has an octet of internal degrees of freedom, composed from spin, valley and orbital two-level systems. Dominance of $n=0$ orbitals over $n=1$ orbitals in low energy quantum fluctuations leads to distinct fractional quantum Hall characteristics compared dominance of $n=1$ over $n=0$. The competition between $n=0$ and $n=1$ orbitals depends sensitively on particle-hole asymmetry and on Lamb shifts due to exchange interactions with the negative energy sea, which must be accounted for simultaneously in assessing the orbital competition. We identify the circumstances under which $n=1$, which supports strong even-denominator FQH states with non-abelian quasiparticles, emerges robustly as the low-energy Landau level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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